Figure 1 The ERG from the isolated perfused bovine retina. A: The b‐wave is dominant in the ERG of the isolated perfused bovine retina under scotopic light conditions. It results from a 10‐microsecond light stimulus at a light intensity of 6.3 mlx at scotopic lighting conditions. B: The a‐wave is dominant in the ERG of the isolated perfused bovine retina after blocking the b‐wave by 1 mM aspartate to the nutrient solution. The a‐wave was generated by using a 10‐microsecond light stimulus of 6.3 mlx at scotopic lighting conditions.